Hypatia Hypatia

astronomer, mathematician & philosopher; date of birth unknown (somewhere between 350 & 370 AD) in Egypt but likely dies in 415 AD; leader of the Neoplatonist school of philosophy;taught math & astronomy & was the leading mathematician in Alexandria; invented the astrolabe for ship navigation & devices for the measuring of the density of fluids; made contributions to geometry, astronomy, number theory & philosophy